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Simplex Trading

Simplex Trading Portfolio holdings

AUM $149B
1-Year Est. Return 62.07%
 

Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.

This Fund
S&P 500
This Quarter Est. Return
+6.46%
1 Year Est. Return
+62.07%
3 Year Est. Return
+116.86%
5 Year Est. Return
+116.02%
10 Year Est. Return
+774.44%
AUM
$122B
AUM Growth
+$7.84B
Cap. Flow
-$3.39B
Cap. Flow %
-2.78%
Top 10 Hldgs %
42.57%
Holding
10,535
New
1,474
Increased
3,350
Reduced
3,913
Closed
1,517

Top Buys

Rank Stock Value
1
MSFT icon
Microsoft
MSFT
+$53.9M
2
TLT icon
iShares 20+ Year Treasury Bond ETF
TLT
+$52.9M
3
NVDA icon
NVIDIA
NVDA
+$47.1M
4
PYPL icon
PayPal
PYPL
+$41.7M
5
GOOG icon
Alphabet (Google) Class C
GOOG
+$28.4M

Top Sells

Rank Stock Value
1
AAPL icon
Apple
AAPL
+$51.4M
2
WMT icon
Walmart Inc
WMT
+$46.4M
3
OIH icon
VanEck Oil Services ETF
OIH
+$34.2M
4
ADBE icon
Adobe
ADBE
+$33.5M
5
SBUX icon
Starbucks
SBUX
+$26.8M

Sector Composition

Rank Sector Weight
1 Technology 0.41%
2 Healthcare 0.21%
3 Consumer Discretionary 0.21%
4 Communication Services 0.2%
5 Financials 0.15%
Name Market Value Portfolio Weight Shares or Principal Change
in Stake 		Capital Flow
AXS icon
8926
PUT
AXIS Capital
AXS
$8.59B
– –
-400
Closed -$21K
FABC
8927
Fabric.AI Inc
FABC
$16.8M
$0 ﹤0.01%
11
-11
-50% -$811
FABC
8928
PUT
Fabric.AI Inc
FABC
$16.8M
– –
-23
Closed -$1K
AZTA icon
8929
PUT
Azenta
AZTA
$1.26B
– –
-7,100
Closed -$316K
BAM icon
8930
Brookfield Asset Management
BAM
$74B
– –
-8,350
Closed -$269K
BANC icon
8931
CALL
Banc of California
BANC
$3.28B
– –
-200
Closed -$2K
BANF icon
8932
CALL
BancFirst
BANF
$3.92B
– –
-1,000
Closed -$83K
BASE
8933
DELISTED
Couchbase
BASE
– –
-1,004
Closed -$16.4K
BATRA icon
8934
Atlanta Braves Holdings Series A
BATRA
$3.53B
– –
-784
Closed -$27K
BBD icon
8935
Banco Bradesco
BBD
$38.1B
– –
-209,691
Closed -$648K
BCC icon
8936
Boise Cascade
BCC
$2.74B
– –
-1,913
Closed -$140K
BCAB icon
8937
BioAtla
BCAB
$5.59M
– –
-37
Closed -$6.36K
BCI icon
8938
abrdn Bloomberg All Commodity Strategy K-1 Free ETF
BCI
$2.56B
– –
-484
Closed -$10K
BCIM
8939
PUT
DELISTED
abrdn Bloomberg Industrial Metals Strategy K-1 Free ETF
BCIM
– –
-1,100
Closed -$22K
BCLI
8940
DELISTED
BRAINSTORM CELL THERAPUTC
BCLI
– –
-12,226
Closed -$507K
BCO icon
8941
Brink's
BCO
$5.02B
– –
-307
Closed -$20.5K
BCO icon
8942
PUT
Brink's
BCO
$5.02B
– –
-700
Closed -$46K
BCRX icon
8943
BioCryst Pharmaceuticals
BCRX
$2.37B
– –
-63,313
Closed -$508K
BDC icon
8944
CALL
Belden
BDC
$4B
– –
-1,400
Closed -$121K
BDRY icon
8945
CALL
Breakwave Dry Bulk Shipping ETF
BDRY
$28.9M
– –
-20,200
Closed -$204K
BDRY icon
8946
PUT
Breakwave Dry Bulk Shipping ETF
BDRY
$28.9M
– –
-13,800
Closed -$139K
BDSX icon
8947
Biodesix
BDSX
$228M
$0 ﹤0.01%
+5
New +$150
BE icon
8948
Bloom Energy
BE
$52.6B
– –
-74,723
Closed -$1.21M
BEKE icon
8949
KE Holdings
BEKE
$16.8B
– –
-2,169
Closed -$35.4K
BELFB
8950
Bel Fuse Inc Class B
BELFB
$3.88B
– –
-60
Closed -$2.75K
356 357
358
359 360

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Simplex Trading's Q2 2023 Portfolio in Review

As of Q2 2023, Simplex Trading held 10,535 positions worth $122B, up 6.9% from $114B the previous quarter. Its ten largest holdings account for 43% of the portfolio.

Simplex Trading's Q2 2023 filing shows 1,474 new, 3,350 increased, 3,913 reduced and 1,517 closed positions. Its largest new stake was Microsoft: 171,935 shares worth $58.5M. The largest sale was Apple, an estimated $51.4M.

By sector, the portfolio is most concentrated in Technology at 0.41% of assets, down from 0.42% a quarter earlier, followed by Healthcare and Consumer Discretionary.

  • Simplex Trading's largest Q2 2023 buy was Microsoft: 171,935 shares worth $58.5M.
  • Simplex Trading added most to iShares 20+ Year Treasury Bond ETF in Q2 2023, an estimated $52.9M increase.
  • Simplex Trading's biggest Q2 2023 reduction was Adobe, cutting an estimated $33.5M.
  • Simplex Trading fully exited Apple in Q2 2023, selling an estimated $51.4M.
  • Simplex Trading's ten largest holdings make up 43% of its $122B portfolio in Q2 2023.
  • Simplex Trading opened 1,474 new positions and closed 1,517 in Q2 2023.
  • Simplex Trading's portfolio value rose 6.9% quarter-over-quarter to $122B.

Based on Simplex Trading's 13F filing for Q2 2023, filed 4 Aug 2023.